ihldee



(No Model.) 2 Sleets-Sheet 1. J. D. IHLDER. SAFETY MAGNET BRAKE.

N0. 596,514. Patented Ja11.4.l898.

r(No Model.) n 2 sheets-sheet 2.

. J. D. IHLDER.

SAFETY MAGNET BRAKE.

No. 596,514. Patented Jan.4,1898.

UNITED STATES PATENT OFFICE.

JOHN D. IHLDER, OF YONKERS, NEW YORK, ASSIGNOR TO THE OTIS BROTHERS daCOMPANY, NEW" YORK, N. Y.

SAFETYl MAGNET-BRAKE.

SPECIFICATION forming part of Letters Patent No. 596,514, dated January4, 1898.

Application iiled September 21,1896. Serial No. 606,561. (No model.) Y

T all whom it may concern:

Be it known that I, JOHN D. IHLDER, a citizen of the United States,residing at Yonkers, in the county of Westchester and State of NewYork,have invented certain new and useful Improvements in SafetyMagnet-Brakes, of which the following is a specification.

My invention relates to safety-brakes, and while it is adapted for manyand various uses it is designed more especially for use in connectionwith elevators and particularly with electric elevators; and it has forits object to provide an automatic safety-brake which shall be simple inconstruction and certain in operation; and to these ends it consists ina brake embodying the various features substantially as hereinafter moreparticularly set forth.

Referring to the accompanying drawings, Figure l is a vertical sectionalview of a brake embodying my invention. Fig. 2 is an end view of thesame, partly in section. Fig. 3 is a vertical section of a modifiedform, and Fig. 4 is an end view of the same.

While the general principles of my invention may be applied to many andvarious forms of brake devices, I have shown it applied to what isordinarily known as a band brake device, and an explanation of itsapplication to this brake will enable those skilled in the art to adaptmy invention to the various constructions with which it can be used.

In the drawings, referring more particularly to Figs. l and 2, Arepresents the shaft of the motor of an elevator or other device, onwhich is rigidly mounted the brake-pulley B of any usual and well-knownconstruction. Arranged to bear on this brake-pulley is a brake-band,shown in the present instance in two parts C C', arranged to bear onopposite sides of the brake-pulley B.

Mounted on a suitable base D, which is preferably a portion of the baseof the motor to be controlled by the brake, is a bracket D', andsupported in this bracket is a shaft E, to which in the present instanceone end of the band C is secured in the usual way, as by adjustableeyebolts c. Also mounted on this shaft E is a bearing F, having attachedthereto a weight F', and pivotally connected to this bearing, as at F2,by an adjustable eyebolt c or otherwise is one end of the band C. Thispivot F2 is eccentrically arranged with relation to the shaft E, asshown, so .that as it moves around said shaft it will tighten or loosenthe brake-band C in the manner hereinafter set forth.

The free ends of the brake-bands C and O are in the present instanceattached to a lever G, pivoted to the standard D, which lever may beoperated in any suitable Way, as through the rod G, to tighten or loosenthe bands in a manner well understood, and the brake is ordinarilyapplied and released through the medium of the lever G in the usual way.I provide some means for normally holding the weight in the positionshown in Fig. l, so that when the weight is in this position thepivotpoint F2 is in practically xed relation to the shaft E, and thebearing F is preferably provided with Wings or extensions F3, which bearagainst the bracket in one direction and prevent the weight from movingupward from the position shown, so that both brake-bands C and O can beequally tightened or applied to the surface of the brake-pulley B. Thebearing, however, is free under certain conditions to move in theopposite direction under the influence of the weight, unless controlledby some external power or force, and I provide an automatic device whichunder normal conditions will hold the weight suspended, but underabnormal conditions will release the weight and allow it to fall andexert tension or force upon the brake-band O to stop the brake-pulley.Vhile various automatic means may be used to accomplish this purpose, Ihave shown in the present instance an electromagnetic device H, in whichthere is a magnet H, the coil of which is included in an electriccircuit H2, which preferably will be connected with a source of powerfor operating the motor, if it is an electric motor, or with any otherelectric circuit controlled by any of the operative parts of theelevator or motor to which the brake is applied. This magnet H is shownas mounted in a housing H3, to which is pivoted the armature H4, shownas a covering for the cup-shaped housing, although of course thisparticular shape and arrangement of the armature are immaterial.

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Connected to and operated by the armature is a cam h, which is arrangedto bear against a projection or cam f on the bearing F. These cams arearranged so that when they are in the relative positions shown in Fig. l4the weight F is sustained in its normal condition; but when the currentowing through the magnet falls below a certain predetermined amount themagnet weakens and the armature rises under the influence of the weight,automatically releasing the latter when it falls, exerting a tension orforce upon the brake-band C, and thereby controlling the brake-pulley Band stopping the motor or engine to which it is applied. After theweight has dropped and applied the brake it is automatically raised toits normal position for the magnet to support it by any desirablemeans-as, for instance, by the operation of the brake-lever G, thisbrake of course being more powerful than the weighted automatic brake,and it will be seen that when the le- 4lettered and need not bespecifically referred to. In this construction, however, instead of twobrake-bands C C' there is a single brakeband C3, the free ends of whichare attached to the lever G, and an adjusting device c3 is provided atone end of the band in a manner well understood. At or about the centralportion of the band is attached a lug O4, and this is provided with anadj usting-screw c4, which rests on a projecting part F4 of the bearingF. The other parts are substantially the same, and in the normalposition shown in the drawings the brakes-band O3 is tightened bydrawing its free ends toward each other through the medium of the leverG. When, however, the automatic device, as the magnet H, releases thearmature H4, the weight is free to operate and through the medium of theprojection F4 draws the under half of the band tightly against thebrake-pulley B. The weight will be set again, as in the other case, whenthe mechanical brake device or lever Gis operated as it centers theband, forcing the weight to its normal position and causing the cams f7L to engage, as before.

From the above it will be seen that I provide an automatic or safetybrake attachment which does not in any way interfere with the ordinaryoperations of the mechanical brake, but which can be used as anemergency-brake and be controlled by a magnet or other means connectedwith some working part of the motor or apparatus connected to andoperated thereby.

What I claim isl. The' combination with a mechanical brake device, of anautomatic safety brake device, and means for operating the same to setthe brake, the automatic mechanism being arranged to be set by themechanical brake, substantially as described.

2. The combination with a mechanical brake device, of an automaticsafety brakedevice connected to operate said mechanical brake andcomprising a weight, means for holding the weight in its normalposition, and automatic means for releasing the weight to apply thebrake, substantially as described.

3. The combination with a mechanical brake device comprising a band, anda lever for operating the same, of an automatic safety brake deviceconnected to the band or bands, and means for releasing the automaticbrake device, substantially as described.

4. The combination with a mechanical brake device comprising a bandapplied to a f brake-pulley, of a weight, connections between the Weightand band or bands, and means for releasing the Weight, the parts beingarranged substantially as described so that when the weight is releasedthe brake is applied automatically without interference with themechanical brake.

5. The combination with a mechanical brake device comprising a bandbearing on a brake-pulley, of a bearing connected to the band, a weightsupported by said bearing, a connection between the bearing and band, anelectromagnet, and connections between the electromagnet and bearing fornormally supporting the weight and releasing the same, substantially asdescribed.

6. The combination with a mechanical brake device comprising a bandbearing on a pulley, of a bearing connected to the band, a weightmounted on the bearing, a cam on the bearing, a magnet the armature ofwhich is p-rovided with a cam engaging the cam on the bearing, wherebythe weight may be released and again set to its normal position,substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

JOHN D. IHLDER.

Witnesses:

WM. P. CoNsTABLE, H. BEATTIE BROWN.

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